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Electricity - 03
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Q.1. If two resistors of 25 ohm and 15 ohm are joined together in series and then placed in parallel with a 40 ohm resistor, the effective resistance of the combination is :
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1 point
20 ohm
40 ohm
0.1 ohm
10 ohm
Q.2. When an electric lamp is connected to 12 V battery, it draws a current of 0.5 A. The power of the lamp is :
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1 point
6 W
0.5 W
12 W
24 W
Q.3. The unit for expressing electric power is :
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1 point
joule
watt
coulomb
volt
Q.4. Which of the following is likely to be the correct wattage for an electric iron used in our homes ?
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1 point
850 W
60 W
250 W
2000 W
Q.5. An electric heater is rated at 2 kW. Electrical energy costs ` 4 per kWh. What is the cost of using the heater for 3 hours ?
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1 point
12 Rupees
36 Rupees
24 Rupees
48 Rupees
Q.6. The SI unit of energy is :
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1 point
joule
Option 2
watt
ohm-metre
Q.7. The commercial unit of energy is :
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1 point
kilo-joule
watt
watt-hour
kilowatt-hour
Q.8. How much energy does a 100 W electric bulb transfer in 1 minute ?
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1 point
600 J
3600 J
100 J
6000 J
Q.9. An electric kettle for use on a 230 V supply is rated at 3000 W. For safe working, the cable connected to it should be able to carry at least :
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1 point
5 A
2 A
10 A
15 A
Q.10. How many joules of electrical energy are transferred per second by a 6 V ; 0.5 A lamp ?
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1 point
0.83 J/s
30 J/s
3 J/s
12 J/s
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